STEORN DEMO LIVE & STREAM in Dublin, December 15th, 10 AM

[captainpecan]

ok running at 1300RPMS now at 1.22V frm a D cell . Voltage is not dropping atm. I have a feeling it is still not tuned well enough but won't know till I get the scope.

I can't help be keep wondering about your rpm's.  Are you seriously getting over 1000 rpms on that 1.22 v battery?  I have seen your other posts and you even spoke of much higher than that.  Now I can't say for sure, because mine still is not a self runner, but it's damn close.  In my experience, to have it tuned properly for that voltage, you should have significantly less rpms.  Not that rpms are a bad thing. The more the better, but in this case I think it may be indicating that your pulse width is to wide.  As far as I can tell with my work so far on this motor, the smaller the pulse with the more efficient.  Now Ossie's newer info seems to show you still want a little length in the pulse, maybe a bit more than I am using even, but his motor also does not appear to be coming anywhere near 1000 rpms.  I could of course be wrong, there are component differences between our setups, but you may want to try and narrow your pulse width a little, which will drop your rpms as a result of course, but you may get a big gain in efficiency.  Just a thought.
Without a scope, I hooked up an led and battery accross my reeds, while not using any part of the circuit.  Then moving the rotor really slow by hand, you can get a pretty good idea by the lighting of the led where your coil is firing and can tune it in fairly well. Once you get it where you want it, take out the led and battery and hook your circuit back up and give it whirl.   Doesn't beat a scope for sure, and you can't really tweak it while it's running this way.  But if you don't have a scope, that's how I'm doing it anyway.  If anyone else has a better way, please let me know.

[Jimboot]

1700 RPM now. I've lost .01V in an hour. Still tuning. D cell at 1.21 v. I'm too scared to measure amps lest I upset the tuning! Is a D cell running a motor for an hour using .01 volt good? I don't think I could run my portable drill for that long at that speed.

[Jimboot]

Would the metglas cores get saturated if I stuck them inside the air coil? At 1900RPM now still 1.21 v . I think the switches connected dorictely to the self tapper toroids is the doing something but not sure what. I think I need to build a control set motor

[Jimboot]

I can't help be keep wondering about your rpm's.  Are you seriously getting over 1000 rpms on that 1.22 v battery?  I have seen your other posts and you even spoke of much higher than that.  Now I can't say for sure, because mine still is not a self runner, but it's damn close.  In my experience, to have it tuned properly for that voltage, you should have significantly less rpms.  Not that rpms are a bad thing. The more the better, but in this case I think it may be indicating that your pulse width is to wide.  As far as I can tell with my work so far on this motor, the smaller the pulse with the more efficient.  Now Ossie's newer info seems to show you still want a little length in the pulse, maybe a bit more than I am using even, but his motor also does not appear to be coming anywhere near 1000 rpms.  I could of course be wrong, there are component differences between our setups, but you may want to try and narrow your pulse width a little, which will drop your rpms as a result of course, but you may get a big gain in efficiency.  Just a thought.
Without a scope, I hooked up an led and battery accross my reeds, while not using any part of the circuit.  Then moving the rotor really slow by hand, you can get a pretty good idea by the lighting of the led where your coil is firing and can tune it in fairly well. Once you get it where you want it, take out the led and battery and hook your circuit back up and give it whirl.   Doesn't beat a scope for sure, and you can't really tweak it while it's running this way.  But if you don't have a scope, that's how I'm doing it anyway.  If anyone else has a better way, please let me know.

I have coloured the face of my mags black so they don't reflect on the tacho, so if the tacho is correct (brnd new) I'm getting around 1900RPMS atm on 1.21 v. I'd love to tune the pulse but I think I'll setup another motor & buy a scope & mess with that. I want to see how long this one goes. . It does seem as twice as fast as my firs rep with ferrite torroids which achieved 1000RPM

[Jimboot]

Hey Ossie any advice? I'm getting a scope tmrw to tune here is the latest vid.
http://www.youtube.com/watch?v=Vq1ntjBR5Rc I'm filming with a web cam atm as all my vid gear is in the office. I'll make a better one soon.